Document Type

Article

Publication Date

1992

DOI

10.1063/1.860309

Publication Title

Physics of Fluids B: Plasma Physics

Volume

4

Issue

12

Pages

4033-4045

Abstract

Lower hybrid waves have been used extensively for plasma heating, current drive, and ramp-up as well as sawteeth stabilization, The wave kinetic equation for lower hybrid wave propagation is extended to include the effects of both magnetic and density fluctuations. This integral equation is then solved by Monte Carlo procedures for a toroidal plasma. It is shown that even for magnetic/density fluctuation levels on the order of 10-4, there are significant magnetic fluctuation effects on the wave power deposition into the plasma. This effect is quite pronounced if the magnetic fluctuation spectrum is peaked within the plasma. For Alcator-C-Mod [I. H. Hutchinson and the Alcator Group, Proceedings of the IEEE 13th Symposium on Fusion Engineering (IEEE, New York, 1990), Cat. No. 89CH 2820-9, p. 13] parameters, it seems possible to be able to infer information on internal magnetic fluctuations from hard x-ray data-especially since the effects of fluctuations on electron power density can explain the hard x-ray data from the JT-60 tokamak [H. Kishimoto and JT-60 Team, in Plasma Physics and Controlled Fusion (International Atomic Energy Agency, Vienna, 1989), Vol. I, p. 67].

Original Publication Citation

Vahala, G., Vahala, L., & Bonoli, P.T. (1992). Effect of magnetic and density-fluctuations on the propagation of lower hybrid waves in tokamaks. Physics of Fluids B: Plasma Physics, 4(12), 4033-4045. doi: 10.1063/1.860309

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